Thermostat



THERMOSTAT s sheetsshet 1 Original Filed Dec. 18, 1918 1 j w Q( Q um QJan, 27,

E. STRANSZKY THERMOS TAT I5 Sheets-Sheet 2 Original Filed Dec. 18 B18Jan, 27, 1925.

E. STRANSZKY THERMOSTAT 19123 3 Sheets-Sheet 5 Original Filed Dec. 18

Patented Jan. 27, 1925.

UNITED STATES PATENT OFFICE.

EMIL STBANSZKY, OF DOVER, OHIO, ASSIGNOR T THE DOVER MANUFACTURING COM-PANY, OF DOVER, OHIO, A CORPORATION 0F OHIO.

THERMOSTAT.

Application led' December 18, 1918, Serial No 267,320. RenewedNovember22, 1920. Serial No. 425,912.

To all lwwm t may concern.:

Be it known that I, EMIL STRANSZKY, a citizen of the United States,resident of Dover, count of Tuscarawas, and State of Ohio, have inventednew and useful Iml0 applying that principle, so as to distinguish itfrom other inventions.

My invention relates to thermostats and particularly to a device of thatcharacter which is adapted to control the closing and u breaking of anelectric circuit. Mv iinproved thermostat is applicable fornse with agreat variety of electrical utilities, such as soldering irons, sadirons, clothes pressing heads, etc., but for the purpose of illustratingthe conditions to which my invention is applicable, I shall hereinafterdescribe the application thereof to a pressing head, furtherillustrating the application by means of the accompanying drawings.

The annexed drawings and the following description set forth in detailcertain means embodying my invention, the disclosed means, however,constituting but diie of various mechanical forms in which the principleof the invention may be applied.

In said annexed drawings:

Figure 1 represents a plan view of my invention as applied to a pressinghead: Figure 2 represents a transverse sectional l view, upon anenlarged scale, taken in the planes indicated by the lines II-II, Fig

ures 1, 4 and 5; Figure 3 represents a fragmentary horizontal section,taken in the plane indicated by the -line III-III, Figure 5; Figure 4represents a fragmentary.

horizontal section. taken in the plane .indicated by the line IV-IV,Figure 5; Figure 5 represents a longitudinal vertical section, taken inthe planes indicated by the lines V-V, Figure 4; and Figure 6 representsa diagram of the electric circuit.

Referring to the annexed drawings, a pressing head of standardconstruction is indicated by the ordinal 1, of which the ressing headmember roper is indicated y the ordinal 2. The incoming line of anelectric circuit is indicated by the ordinal 3 ada ted by a suitableswitch to be connecte or disconnected with any suitable sourceof'electric energy. 'Contained in the circuit'is a resistance heatingelement 4 of any suitable design, the same being suit-ably disposedadjacent the pressing member 2, as plainly shown in Figure 2, theoutgoing element of the circuit from the resistance element 4- beingindicated by the ordinal 5. The outgoing terminal of the circuit fromthe pressing head 1 is indicated by the ordinal 6 connected by thecircuit portion 7 with the aforementioned switch. pressing head 1 isformed with an upstanding peripheral flange 8 and is adapted to supportin suitable screw holes 9 formed in upstanding lugs10 of thepressingwhead, the usual covering or canopy, not shown.- Theelementsaforemcntioned are standard and are utilized with the followingdetail of' my invention.

I have formed a chamber 11 in the pressing head 1 and disposed therein arectangular bed 12 comprised of four side members, as plainly shown inFigure 3, suitable insulation 13 being interposed between the exteriorfaces of the walls 12 and the Walls of the chamber 1l. This chamber 11is of a depth such as to leave a proximately Mt. of material between t ebottom thereof and the pressing face 2 of the member 1, as substantiallyindicated in Figure 2. Formed up from the upper face of the pressinghead 1 is a second larger rectangular frame 14 covered by a suitableplate 15 secured thereto by means of corner screws 15 and upon one endcf this cover plate 15 is mounted a dial 16.

Forming a part of the circuit intermediate the -end 5 of the heatingelement 4 and the outgoing terminal 6 are a pair of copper strips 17 and19 provided with coliitactl points 18 and 20, respectively, and contactpoint 18 being adjustable relatively to the strip 17 by' means of ascrew 18. The copper strip 19 is in reality comprised of two portions 19and 19 electrically connected by the circuit portion 6 and mechanically'connected by a fiexible spring strip 19. This spring strip 19* normallholds the contact points 18 and 20 toget er and yet allows for theirready separation, as hereinafter fully described.

The strips 17 and 19 are secured at one end uponthe two side faces,respectively, of an insulation member 21. Secured to the upper This faceof said .insulation member 21 by a screw 212 is a plate 22 extended atone end beyond said insulation 21, as plainly shown in Figure 5. Ahorizontal partit-ion member 23 is secured within the space defined bythe frame12 by means of screws 23 let into interior end shoulders 12 ofsaid frame 12. Said partition member 23 is also formed with verticalposts 25 and 26, plainly shown in Figure 5.y The insulation member 21 isformed with a vertical hole 21 intersected by said post 25, a coppersleeve 27 being conta-ined within said hole 21 and surrounding said post25. Said insulation member 21 is supported by a metallic plug 28 uponthe partition member 23, the. plate 22 and said member 28 being formedwith similar vertical holes 21 registering with said aforementioned hole21, as plainly shown in Figure 5. The upper end of said post 25 isscrew-threaded and the elements 21, 22 and 28 are held to place'by meansof a nut 25 serving as a guide and secured upon said thread. Alongitud-inally disposed lever 29 formed with `an elongated transverseslot 30 intersected by said post 25 is secured intermediately of itsends to the projecting end of the plate 22 by a screw 31. One end ofsaid lever 29 is formed with a vertical hole 32 by which said lever ispivoted upon an upper reduced end portion 26 of the 26. The othery andfree end of the lever 29 supports a screw 29 intersecting an elongatedtransverse slot 152 formed in the cover late 15 and supporting at itsupper projecting end a button 39. Secured between the cover pla-te 15and the button 39 is a pointer 38 adapted to register with theaforementioned dial 16.

Disposed within the lowermost portion of the frame 12and beneath thepartition member 23 is a member33 adapted to be bent pro portionately tothey amount of heat imparted to the pressing head 1. Said member iscomprised of two joined ba rs 33 and 332 of metal of differentcoefficients of expansion, whereby said bar 33 will be bent theseproportioned amounts. Said member 33 is secured at one end to a member34 suitably mounted by means of screw 35 upon a boss, not shown, formedup from the bottom of the chamber 11. To the other end of the member 33is secured a member-36 provided with a vertically extendin finger 37intersecting the slot 24 formed 1n the partition member 23 and disposedat its upper end adjacent to the circuit strips 17 and 19, a suitableinsulation sleeve 36 being mounted upon the top of the finger 37.

In the circuit diagram shown in Figure 6, a condenser 40 ofstandard-construction is shown as cut into the circuit by means ofcircuit connections 41 and 42. A pilot lamp 43 is also shown as cut intosaid circuit by suitable connections 44 and 45. The use of post thecondenser 40 is the standard one of preventing arcing and the pilot lamp43 may be used when and as desired.

Itis evident from the foregoing description and the accompanyingdrawings that the bending of the member 33, under the infiuence of theheat imparted to the pressing head 1, will cause the finger 37 carriedby said lmember 33 to intercept the strip 19 and break the connect-ionbetween the contacts 18 and 20. As lainly shown in Figure 2, the loweredge ci) the strip 17 is formed with a slot 17 'whereby the finger 37may pass said strip1'7 without contacting the same. It is furtherevidentfrom the description and drawings that the circuit strips 17 and19 can be set or regulated by swinging as a unit, whereby greater orless amounts of bending upon the part of the member 33 will be necessarybefore the finger 37' contacts with the strip 19 to separate thecontacts 18 and 20.

Specifically, `this regulation is effected through the insulating member21 secured to the plate 22, the strips 17 and 19 secured to the sidefaces of the insulating member 21 will be moved, in so far as theircontact points 18 and 20 are concerned, in a direction opposite to themovement of the button 39.

What I claim is:

1. A thermostat for an electric circuit including a heating element inthe circuit, means for making and breaking the circuit comprisingrelatively movable members, a bar adapted to be moved amountsproportioned to the heating of the element, means for setting oradjusting said circuit making and breaking means as a unit, said meanscomprising a post suitably supported, a lever pivoted at one end uponsaid st, fixed intermediate its ends to saidl circuit making andbreaking means, and formed at its other end with an operating button anda pointer, a dial disposed adjacent said pointer and a fingermountedupon said bar and whose path of movement intersect-s one of themembers of said circuit making and breaking means.

2. A thermostat for an electric circuit including a heating element inthe circuit, two relatively movable circuit making and bre-aking membersincluded in the circuit, mea-ns tending to hold said members normally incontact, a suitable support for said members and insulated therefrom, alever pivotof said lever, and actuatingmeens adapted to be moved amountsproportionto the heating of the element, said actuating means adapted tocontrol the relative movement of said current making and breakingmembers.

3. A thermostat for an electric circuit iucluding a. heating element inthe circuit, a bar adapted to be moved amounts proportion to the heatingof said element, a finger on said bar, two relatively movable membersformed each with a contact point comprising part of said circuitadjacent to said finger, one of said members being comprised of twoelectrically connected members which are mechanically joined by a'springnormally 15 holding` said contact points together, a support for saidmembers, an insulation mounted intermediate said supportv and saidmembers, a plate mounted upon said insulation, a post suitablysupported, and a lever pivoted at one end upon said post securedintermediate its ends to said plate, and formed at its other end with anoperating button, the path of movement of said finger intercepting saidcontact members.

Signed by me, this 7th day of December,

EMIL STRANSZKY.

